What is the word for someone who can spell well?

There isn't one specific word for someone who can spell well. However, you can use descriptive phrases like:

* A good speller

* Someone with excellent spelling skills

* A skilled orthographer (orthography is the study of spelling)

* Someone who has mastered spelling

* A wordsmith (this term is more general, but often implies a good command of language, including spelling)

You could also use more informal terms like:

* A spelling whiz

* A spelling champ

* Someone who can spell like a pro